Compressor mounting



March 10, 1953 o. H. SCHELDORF COMPRESSOR MOUNTING Filed Dec. 14, 1949=7 In ve nbor Owen H. Schel His Attorne Patented Mar. 10, 1953COMPRESSOR MOUNTING Owen H. Schel'dorf, North East, 2a., assignor toGeneral Electric Company, a corporation of New York.

Application December 14, 1949, Serial No. 132,881

7' Claims. 1

My invention relates to motor-compressor assemblies and moreparticularly to arrangements for mounting such assemblies Within anenclosing casing.

It is an object of my invention to provide a motor-compressor assemblyincluding an improved arrangement for maintaining a uniform air gapbetween the stator and the rotor of the motor.

Further objects and advantages of my invention will become apparent asthe following description proceeds and the features of novelty whichcharacterize my invention will be pointed out with particularity in theclaims annexed to and forming part of this specification.

For a better understanding of my invention reference may be had to theaccompanying drawing in which Fig. 1 is an endelevation view partly insection of a motor-ccmpressor assembly embodying my invention; Fig. 2-is a side elevation view taken along the line 22 in Fig. 1-; Fig, 3 isan enlarged view showing a detail of my invention; Fig. 4 shows theconstruction of Fig. 3 in another stage of the assembly; and Fig.5i1lustrates a modified form of my invention.

In carrying out the objects of my invention a rotor-compressor assemblyis positioned within an enclosing casing with the rotor in proper spacedrelationship to the stator. The enclosing casing and the frame of thecompressor are shaped to receive spaced elements which areforced intogrooves in the casing and theframeto fix the rotor-compressor assemblyin position.

Referring to Figs. 1 and 2 there is shown anenclosing casing or housingI of hollow cylindrical shape. Within the casing is arranged amotor-compressor unit including a motor 2 and a compressor 3. Forpurposes of illustration an enclosed motor-compressor unit for use asrefrigerating apparatus is illustrated, but motor-compressor unitsemployed for other purposes may equally well be constructed inaccordance with. my invention. In the form illustrated the ends of thecasing I are closed by end plates, one such end plate being shown at A.Compressed refrigerant is discharged from the compressor 3 through anexhaust muffler 5- and a conduit 6 to the condenser (not shown) of therefrigerating system and vaporized refrigerant is returned from theevaporator (not shown) to the interior of the. casing I through theconduit I. This vaporized refrigerant passes from the casing through anintake muffler 8 to the compressor.

The motor 2 includes a stator 9 and a rotor I0 mounted to rotate withinthe stator. The stator 9 includes a laminated core structure it andwindings ltdisposed within slots in the. core structure. The stator issecured in fixed position. within the casing I.

The compressor 3 includes a frame 1'3 which is shaped to provide a bossI4 having an. opening; therein providing a. bearing surface for the.drive shaft I5 which connects the rotor and the. stator. The rotor issupported entirely by the frame of the compressor through the shaft I5,forming av rotor-compressor assembly.

In order to position this rotor-compressor assembly longitudinallywithin the casing, the casing is shaped to provide a shoulder [-6. Theshoulder I6 may be formed in any suitable manher, for example, byrolling a recess in the wall. of the casing to force the wall inwardlyat the. shoulder [6. The frame [3. of the compressor includes a portionI!v which is arranged to abut. the shoulder I6 affording a positivelongitudinal positioning for the rotor-compressor assembly.

For satisfactory low noise operation it is necessary that a uniform gapbetween the rotor and the. stator be maintained throughout the peripheryof the rotor. By my invention the rotorcompressor assembly is easily andpositively mountedso that thisuniform air-gap is provided. The. casing Iis provided along its. interior surface. with. an annular groove. I8which is spaced longitudinally from the shoulder I6; As is, most.clearly illustrated. in Figs. 3' and 4, the, frame por-. tion I! issimilarly provided with an annular groove I9. The groove I19 is formedso that in the assembled position of the compressor, the grooves I8 andI9 are in aligned relationship. During the assembly operation therotor-com pressor assembly and the casing, are held in. anysuitablefixture for temporarily maintainin the proper uniform air gap betweenthe rotor and the stator. In order to fix the parts permanently in thisposition a plurality of tubular elements or keys 20.- are insertedbetween the. frame. portion I7 and the casing I at intervals about thecircumference. In the; form. illustrated four such keys are used, thekeys being equally spaced at intervals about the casing; The frameportion I 'I- is shaped. to provide a. recess N for receiving the. keys20.. With the keys disposed at proper intervals a force is. applied toeach of the keys by a pressing tool 22. This force squeezes. andflattens. the. keys 2.0; into. the. laterally elongated flattened shapeshownv in Fig. 4. As: the: keys are flattened the sides of the keys areforced into the grooves l8 and I9 forming a support for therotor-compressor assembly and radially positioning aceaeca this assemblyso that the uniform air gap temporarily maintained by the fixture ispermanently fixed.

It can be seen that the construction described above compensates forslight variations which may occur in manufacturing and further that theneed for carefully machined surfaces is minimized since the periphery 23of the frame portion I1 is spaced by the keys 20 from the inner wall ofthe casing.

In Fig. 5 there is illustrated a modified form of my invention whichdiffers from that described above only in that each of the keys 24 is ofhollow triangular cross section. One side of the triangular key 24 isdisposed against a fiat face 25 of the frame portion and a force isexerted against an apex 26 of the key by the pressing tool 22. The forceexerted by the tool 22 flattens the key 23 into substantially the shapeshown in Fig. 4, forcing the key laterally into the grooves l8 and H3 inthe manner described above.

While I have shown and described specific embodiments of my invention asapplied to an en closed refrigerating motor-compressor unit, otherapplications will occur to those skilled in the art, and I intend tocover by the appended claims all modifications within the spirit andscope of my invention.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is:

1. A motor-compressor assembly comprising a casing having a shoulder onthe interior surface thereof, said casing having an annular groovetherein spaced from said shoulder, a motor-cornpressor unit having aframe portion abutting said shoulder, said frame having an annulargroove therein concentric with said first-mentioned groove, and aplurality of elements each engaging both of said grooves and having apressed fit therewith to hold said motor-compressor unit in fixedposition with said casing.

2. A motor-compressor assembly comprising a. casing having a shoulder onthe interior surface thereof, said casing having an annular groovetherein spaced from said shoulder, a motor-compressor unit having aframe portion abutting said shoulder, said frame having an annulargroove therein concentric with said first-mentioned groove, and aplurality of flattened hollow elements each engaging both of saidgrooves to hold said motor-compressor unit in fixed position with saidcasing.

3. A motor-compressor assembly comprising a hollow cylindrical casinghaving a shoulder on the interior surface thereof, said casing having anannular groove therein spaced from said shoulder, a motor-compressorunit having a frame portion abutting said shoulder, said frame having anannular groove therein concentric with said first-mentioned groove and aplurality of flattened hollow elements equally spaced about the internalperiphery of said casing, each of said elements engaging both of saidgrooves to hold said motor-compressor unit in fixed position within saidcasing.

4. A motor-compressor assembly comprising a casing having a shoulder onthe interior surface thereof, a stator mounted Within said casing, arotor-compressor assembly including a frame portion arranged within saidcasing, said frame portion abutting said shoulder, and means formaintaining a uniform air gap between the rotor and said stator, saidmeans comprising an annular groove in said casing spaced from saidshoulder, an annular groove in said frame portion concentric with saidfirst-mentioned groove, and a plurality of flattened hollow elementsengaging both of said grooves.

5. In a motor-compressor assembly comprising casing having a stator anda rotor-compressor unit mounted therein, the compressor of saidrotor-compressor unit including a frame portion, the method ofpositioning the rotor within said stator with a uniform air gap whichcomprises providing said casing with an internal shoulder, forming anannular groove in said casing spaced from said shoulder, forming acomplementary groove in said frame portion of said compressor, holdingsaid rotor in properly spaced relationship with said stator, placing aplurality of nollow elements in spaced relationship between said frameportion and said casing, and exerting a force on said elements toflatten said elements and to force said elements into engagement withboth of said grooves.

6. In a motor-compressor assembly comprising a casing having a statorand a rotor-compressor unit mounted therein, the compressor of saidrotor-compressor unit including a frame portion, the method ofpositioning the rotor within said stator with a uniform air gap whichcomprises providing said casing with an internal shoulder, forming anannular groove in said casing spaced from said shoulder, forming acomplementary groove in said frame portion of said compressor, holdingsaid rotor in properly spaced relationship with said stator, placing aplurality of hollow tubular elements in spaced relationship between saidframe portion and said casing, and exerting a force on said elements toflatten said elements and to force said elements into engagement withboth of said grooves.

'7. In a motor-compressor assembly comprising a casing having a statorand a rotor-compressor unit mounted therein, the compressor of saidrotor-compressor unit including a frame portion, the method ofpositioning the rotor within said stator with a uniform air gap whichcomprises providing said casing with an internal shoulder, forming anannular groove in said casing spaced from said shoulder, forming acomplementary groove in said frame portion of said compressor, holdingsaid rotor in properly spaced relationship with said stator, placing aplurality of hollow elements of triangular cross section in spacedrelationship between said frame portion and said casing, and exerting aforce on said elements to flatten said elements and to force saidelements into engagement with both of said grooves.

OWEN H. SCHELDORF.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,971,723 QDell Aug. 28, 19341,991,723 Betz Feb. 19, 1935 2,001,492 Herlinger May 14, 1935 2,062,045Van Deventer Nov. 24, 1936 2,246,272 Davidson June 17, 1941 2,279,932Von Henke Apr. 14, 1942 2,415,905 Overton Feb. 18, 1947

